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training pages displaying blank at random....

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03-07-2016
06:17 PM
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Not sure why but when I use the training pages many of them seem to randomly display as shown with no data or information.
I've replicated this using Brave, firefox, Safari, and Chrome.
Using a MacBook Air.
Any idea why this might be happening?
In addition to online training, also wondering if there are books I can get that might describe some of these topics?
I have looked in AMZ and not seen any.
Any suggestions on written materials I could read offline , say on airplanes, would be helpful.
Thanks in advance.